Shoku (??, November 30, 1177 – December 24, 1247), sometimes called Seizan (??), was a disciple of Honen, founder of the Jodo-shu Buddhist sect.
Shoku later succeeded Johen, another disciple of Honen, as the head of a former Shingon Buddhist temple, Eikando, established a separate branch of Jodo-shu called the Seizan branch (after its namesake), and completed the transition of Eikando from a Shingon temple into a Jodo shu one.